feat: exit-early flag when provider or secret not found

[hhollenstain]

We ran into an issue where an application started where the provider timed out.

time="2023-05-22T17:43:31Z" level=error msg="failed to resolve secrets" error="failed to get secret from Google Secret Manager: rpc error: code = DeadlineExceeded desc = context deadline exceeded"

Ideally we want to get an option to exit early when the provider fails to connect and or fails to find a secret. In our use case it is easier to track down API outage or improper secret configuration with a non zero exit.

This would include a feature for #21

With this setup you can use either --exit-early bool flag or env EXIT_EARLY=[true|false]

./secrets-init --provider google  -- env |grep -i 'TEST_ENV'
ERRO[0000] failed to resolve secrets                     error="failed to get secret from Google Secret Manager: rpc error: code = NotFound desc = Secret [projects/<ACCOUNTID>/secrets/NAME_OF_SECRET_broken] not found or has no versions."
TEST_ENV_WORKING=gcp:secretmanager:projects/<ACCOUNTID>/secrets/NAME_OF_SECRET
TEST_ENV_BROKEN=gcp:secretmanager:projects/<ACCOUNTID>/secrets/NAME_OF_SECRET_broken

./secrets-init --provider google --exit-early  -- env |grep -i TEST_ENV
ERRO[0000] failed to resolve secrets                     error="failed to get secret from Google Secret Manager: rpc error: code = NotFound desc = Secret [projects/<ACCOUNTID>/secrets/NAME_OF_SECRET_broken] not found or has no versions."
ERRO[0000] Exiting early unable to retrieve secrets   

envVar set

export EXIT_EARLY=true
./secrets-init --provider google -- env |grep -i TEST_ENV
ERRO[0000] failed to resolve secrets                     error="failed to get secret from Google Secret Manager: rpc error: code = NotFound desc = Secret [projects/<ACCOUNTID>/secrets/NAME_OF_SECRET_broken] not found or has no versions."
ERRO[0000] Exiting early unable to retrieve secrets